Mixer for explosives.



PATENTBD OCT. 16, 1906.

No. 833,658. V

' H. AUGHU.

MIXER FOR BXPLosIvBs. APPLVIOATIN FILED MAE.16,17906.

nnrrnn sfrarns PATENT FFICE.

Specification of Letters Patent.

Patented Oct. 16, 1906.

lApplication filed March 16, 1906. Serial No. 306,461.

T0 all whom, it may concern:

Beit known that I, HENRY AUcnU, a citizen of the United States, residing at Emporium, in the county ofCameron, State of Pennsylvania, have invented certain new and useful Improvements in Mixers for Explosives, of which the following is a specification, reference being had therein to the accompanying' drawings.

This invention relates to a mixer for explosives, and particularly to a novel construction and arrangement of rakes or mixing-arms and means for driving the same.

The invention has for an object to provide a novel and improved `construction of the mixing ralres or arms relative .to the bowl or receptacle in which the explosive-mixing is done, together with means for introducing airor other iiuid through said arms, so as to agitate and cool the ingredients during their mixture in the bowl.

A further object of the invention isto prol vide a novel and improved-construction and arrangement of raising means for the rakesor arms, together with means for permitting and effecting a rotation thereof relative to the bowl into which they are introduced.

Other and further objects and advantages of the invention will be hereinafter fully set forth and the novel features defined by the appended claims.

in the drawings, Figure 1 is an elevation of the invention with the mixing-bowl in section. Fig. 2 is a horizontal section on the line 2 2, Fig. 1. Fig. 3 is a detaif vertical sectipn ofthe air connection with the shaft of the arms, and Fig. 4 is an enlarged vertical section through one of these arms or rakes.

Like Vnumerals of'nreference indicate like parts throughout the several views of .the drawings.

The numeral 1 designates a tub or other suitable receptacle comprising the mixingbowl, which 1s rovided with a lead lining 2 and intowhich the rakes or arms 3 are introduced from above, so as not.toc"ontact with the lining of the bowl at anypoint or to have any support therein. Thesup'ppit for these l ar shaft4,

'rakes or arms comprises 'the'tu rovided at its lower'end with'tubular rakeeads 5, disposed at an angle tothe shaft and to which the rake-teeth 3 aresecured in anyY vdesired. manner, and each tooth is provided at its lower end 'withy a discharge-opening 6 therefrom into the mixture in the bowl.

or other Huid To prevent friction in the movement of the teeth or by contact with any metallic substance by which s arking might occur, the teeth are herein s own as provided with a covering of rubber or othenproper antifriction material, as indicated at 7 1n Fig. 4, although the teeth-heads may be constructed of suitable material to prevent the necessity of this covering. The teeth are arranged in the heads 5 so that the openings'therefrom in the tooth of each` head are at a diderent point radially distant from the axis of rotation, so that the discharge of airinto the bowl covers the entire surface thereof, asindicated by dotted lines in Fig. 2. As shown in'that figure, the point of exit in one set of rakes is spaced out of alinement withthose of the next succeeding or preceding set thereof. At the end of eachof the heads a short rake 8 is provided and curved at its point of discharge, so as to direct the fluid against the side of the bowl, so as to deflect any rising portion of the mixture at the ed es thereof due to the centrifugal motion. ach of the heads is provided at its end next to the driving-shaft with inwardly-curved teeth 9, directed toward a common center in order to prevent the collection at that point ofa body of the mixture, which would not otherwise be thoroughly'impregnated, as it lies directly beneath the axis of rotation, and these teeth therefore agitate this portion, so as to ,cause to permit the escape of air its thorough mixing 'with the remaining. ma- .i

12, carried by the shaft 13, to which power is appliediany desired manner-for inst ance, by pulley 14. This permits the raising ofthe driving-shaft through the gear, and When-in itsposition within the bowl the shaft 4issupported by means of an adjustable set-collar .15, resting upon the bearing-platel, carried upon the upper face of the frame 17. The shaft is raised and lowered by means of the cable 18, extendingovera` suitable pulley 19 disposed in the frame 20 and connected with roo the shaft 21 of acylinder and piston lifting device, as shown at 22, which device is adapted to be controlled through the connections 23, extending to the valve 24, the lower end of the piston 'being provided witha connectin device25 for the cable 19. A

or the u ose of permitti 4fthe free rotation of t ev ving-shaft in re ation to the air-pi e 26, which enters the same, any desired which -is shown in detail Fig. 3, wherethe' air-pipe is 'provided with a packed connection 27 and with a bolting-ilange 23, mounted thereon, from which the bolts 29 extend to a cooperating flange 30, threadedupon or se cured to the upper end of the driving-shaft 4 and providedwitha. suitable opening commu? nicating with the airpipe. The arr-pipe is supported in a cross-frame 31 and ,held therein against rotation, while the driving-shaft rotates -upon the connection therewith just described. For the purpose of securing a non-'rotatable connection lof the cable with the shaft a loosely-mounted plate 32 is disposed beneath the ilange-couplin 30 to bear l against the under face thereof, an to this the connectors 33 from the lifting-cable extend, as shown in Fig. 1. The air or fiuid is sup-A plied to the pipe 26 by means of a iexible connection 34 to -allow vertical movement of the connection in the raising and lowering of the shaft and its rakes.

In the operation of the invention the ingredients 'to be nixedvfor instance, any nitroglycerin or other dynamite compounds-are introduced into the bowl, and the rakes are lowered therein and Arotated continuously. The teeth by rtheir staggered arrangement upon the heads cover the entire area of the bottom of the bowl, as they are arranged to travel in different paths, and being spaced from ythe. sides of the bowl all danger of -friction therewith is prevented. The arran ement of the deflectedteeth at the ends of t' eA heads forces down the mixture to prevent it fiowing up at the outer edges of the bowl, while the centrally-disposed teeth prevent the collection 'of a body of unmixed ingredients at the center thereof. The driving and lifting connection herein shown permits the ralie-arms to be freely raised and lowered while still being driven, so that the teeth may be introduced to any desired depth in the mixture, although it is preferablelthat they reach near the bottom of the bowl in order that the air or fluid introduced may permeate upward through the mixture, and thus carry therefrom the heat generated by the chemical reactions between the ingredients. The invention, therefore, presents a novel and simple construction of parts for perfectly and throughly mixing the ingredients,while practically eliminating the great dangers surroun ng previous methods of mixing the 65 same by hand or machinery. It will be seen crm of cou lin ma be used one p g y Qi@ amixingbowl,avertical tubular riving-shaft that the construction of the 'teeth is such as to permita reversal in their direction of travel,

which .is desirable under some conditions of set forth its merits, what I claim, and desire l to secure by Letters Patent, is-

1. In an apparatusvfor mixin explosives,

mounted-centrally above the bowl, hdrizontal' tubular rake-heads radiating from the lower portion of said shaft, depending vertical tubular apertured rake-teeth extending downward from said heads, and inserted on v said heads at varying distances from the center of revolution of .said teeth, so that the paths of travel of the teeth upon two adjacent heads do not coincide. a

2. In an apparatus for mixing explosives, agmixing-bowl, a vertical tubular drivingshaft mounted centrally above the bowl, horlzontal tubular rake-heads radiating from the lower portion of said shaft, depending tubular vertical apertured rake-teeth extending downward from said heads, and outwardly-deflected teeth at the ends of said heads.

3. In an apparatus for mixing exploslves, a mixing-bowl, a vertical tubular drivingshaftv mounted centrally above the bow horizontal tubular rake-heads radiating from the lower portion of said shaft, de ending vertioaltubular apertured rake-teet extending downward from said he ads outwardly-defiected teeth at the ends of said heads, and inwardly-deflected teeth disposed at the ends of said heads next to the driving-shaft.

4. In an apparatus for mixing explosives, a mixing-bowl, a vertical tubular drivingshaft mounted centrally above the bowl, horizontal tubular rake-heads radiating from the lower portion of said shaft, depending vertical tubular apertured rake-teeth extending downward from said heads, outwardly-deflected teeth at the ends of said heads, inwardly-de-v ilected teeth disposed at the ends of said heads next to the driving-shaft, means for supplyingfluid to the driving-shaft and rakes, and means for rotating said shaft.

5. In an apparatus for mixing'explosives, a mixing-bowl, a vertical tubular drivingshaft mounted centrally above the bowl, horizontal tubular rake-heads radiating from the lower portion of said shaft, depending vertical tubular apertured rake-teeth extending down- .ward from said heads, outwardly-deflected teeth at the ends of said heads, inwardly-deflected teeth disposed .at the ends of said heads next to the drivingeshaft",- means for supplying fluid to the driving-shaft and rakes, means for rotating said shaft, and means for effectin a longitudinal movement .of .the shaft wlile in driving relation.

6. In a mimng apparatus, atuhular shaft,

TOO

IIC'

' pending tubular apertured rake-teeth extendssss 8 tubular raken-heads at one' end thereof, de-

'in presence of two witnesses. HENRY AUCHU.

ing downward from said heads, and inserted on said heads at varying distances from the center of revolution of said teeth, so that the paths f travel of the teeth upon two adjacent heads do not coincide.

Witnesses:

H. A. Cox, GEO. P. JONES.

In testimony whereof I eix my signature 

